Introduce framework for running basic tests for entities (#1344)

* Introduce framework for running basic tests for entities

* Add pipeline tests to CircleCI config

* Make pipeline tests more configurable and fix CircleCI config

* Add coverage dir to pipeline package

* Add basic tests for all exchange event entities

* Add tests for remaining entities

* Create separate test scripts in package.json and add new info to README

* Update db_setup.ts to revert migrations even if you are using docker

* Automatically pull the postgres image if needed

* Add comment about why NumberToBigIntTransformer is needed

1 files changed, 16 insertions, 0 deletions

diff --git a/packages/pipeline/src/utils/transformers/big_number.ts b/packages/pipeline/src/utils/transformers/big_number.ts
new file mode 100644
index 000000000..a0471a5e3
--- /dev/null
+++ b/packages/pipeline/src/utils/transformers/big_number.ts
@@ -0,0 +1,16 @@
+import { BigNumber } from '@0x/utils';
+import { ValueTransformer } from 'typeorm/decorator/options/ValueTransformer';
+
+export class BigNumberTransformer implements ValueTransformer {
+    // tslint:disable-next-line:prefer-function-over-method
+    public to(value: BigNumber): string {
+        return value.toString();
+    }
+
+    // tslint:disable-next-line:prefer-function-over-method
+    public from(value: string): BigNumber {
+        return new BigNumber(value);
+    }
+}
+
+export const bigNumberTransformer = new BigNumberTransformer();